Lumen Technologies is bowing unceremoniously out of the content delivery network (CDN) business, rendering its legacy technology infrastructure virtually worthless. In less than a decade, a trend which has seen service providers build out their own capacity as recognition of CDNs becoming increasingly critical for video delivery, has rapidly unraveled. Lumen’s CDN business joins Verizon’s Edgecast in the graveyard of CDN businesses operated by US telcos, which have failed to match Akamai’s expansion into edge and cybersecurity services. The sale of Edgecast to Yahoo – and subsequent spin-off to form Edgio – suggests a glimmer of hope for life after Lumen for these collective CDN assets. However, given the collapse of Edgio’s share price, we think a Lumen CDN spin-off…